$OpenBSD: patch-src_fe-common_core_Makefile_in,v 1.10 2017/06/07 21:57:46 sthen Exp $
--- src/fe-common/core/Makefile.in.orig	Tue Jun  6 19:12:14 2017
+++ src/fe-common/core/Makefile.in	Tue Jun  6 23:19:02 2017
@@ -375,7 +375,7 @@ AM_CPPFLAGS = \
 	-I$(top_srcdir)/src -I$(top_srcdir)/src/core/ \
 	$(GLIB_CFLAGS) \
 	-DHELPDIR=\""$(datadir)/irssi/help"\" \
-	-DTHEMESDIR=\""$(datadir)/irssi/themes"\"
+	-DTHEMESDIR=\""$(sysconfdir)/irssi/themes"\"
 
 libfe_common_core_a_SOURCES = \
 	chat-completion.c \
